Telephone hand set



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Sept. 28 w26. l, www@ y H. R. CLARKE TELEPHONE HAND SET Filed Feb. '7, 1923 2 Sheets-Shee 2 Patented Sept.. 28, 1926.

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HARRY E. CLARKE, F EAST ORANGE, NEW JERSEY, ASSIGNOR T0 WESTERN ELEG- TRIC COMPANY, INCORPORATED, OF NEW'YORK, N. Y., CORPORATION 0F NEW y Yoan. i

TELEPHONE HAND snr.

Application led February 7, 1923. Serial No. 617,532.

This invention relates to telephone hand sets, the object being to eliminate the tendency to howl which is present in sets of this .type and otherwise improve the structure with respect to the convenience of mounting and the accessibility of the parts. In accordance with the general features of this invention certain resonance effects which tend to produce howling when the setis 1n usev are eliminated by providing couplings Ibetween the handle of the set and the instruments which will not be resonant at frequencies tending to producey howling.l

In the preferred form of this inventlon the support for the receiver comprlses. three l f .separated lugsof comparatively small .area

v adapted to receive screws or similar attaching means for securing the receiver, and the transmitter is screwed dlrectly mto the hanf i dle thereby eliminating large and irregular 1 contact areas and at the same time-providing for the rigid attachment of the transmitter and receiver to the handle. The conductors are embedded. in the handle and connec- 35 tion is made tothe receiver through metalliclugs embedded in the supporting lugs and the screws for supporting the receiver and to the transmitter. .through a threaded v bushing which also serves as a support for the transmitter.

.n the drawing: Fig. 1-is a side' view of the hand set, -part in section, showing the manner of supporting the instruments on the handle; Figs. 2 and 3 show alternative wiring y schemes for the hand set;

Fig. 4 is a front'view of the hand set with the instruments removed;

, I Fig. 5 is a rear view of the receiver; and 40. Fig. 6 is a rear view of the transmitter.

Una handle 7, preferably solid` and of phenol plastic` compound, and having a fundamental mode of vibration exceeding 1000 cycles, thereis supported at one end a relceiver 5 and at the opposite end a transmltter 6. Embedded in the handle are conductors for making the required electrical connections to the receiver 5. As shown these conductors, 8, 9 and 10, terminate at the relceiver end of the handle in separate threaded inserts 11. At the transmitter end the conductor 9 terminatesA in a large -threaded bushing 12, which also serves as a support for the transmitter 6, and conductors 8v and 1.0 terminate in inserts23 and 24 which serve as terminals for making connections to a cord 28. The insertsy 11 are preferably under flush or slightly below the surface 19. The bushing 12 is preferably flush but may be slightly underiush with the .annular -surfaceA 29 which forms a seat for the transmit ter case 16. Y'

v'lhe receiver .comprises a suitable mag.Y netic structure 15 mounted in acase 21 by any suitable means, such as screws 27. As-

.sociated with the vmagnetic--structure 15 is the usual diaphragm 38 ,clamped in the `usual manner between a cap 39 and the case 21. The receiver case 21.i S preferably made of phenol plastic' compound and vhas a comp aratively thick base and walls so as to provide a rigid structure, which `will have n0 resonance below 1800 cycles perfsecondav The base of the case 21 mayfbe provided with three'bosses 43 which vseataccurately against 75 the surface 19 of thehandle 7.l Holes:con centric'with the bossesr43 are provided in the case 21` andl through these holefs..mount-' ing screws 22 .engage the inserts 11 tov secure the receiver to the handle. limiting the surface in contact to.A substantially three points a rigid joint is .formed which is prac# tically perfect, and non-resonant below 1800 cycles per second. Obviously the. bosses may be provided on the handle or smallseparate spacers may be used. i

The transmitter comprises a carbon containing button 30 supportedby any suitable means in a cup 31 having comparatively thick walls. A spring 37 holds the button 30 in operative relation to the diaphra 32. Seated in an annularrecess in the e ge of the cup 31 and held therein by a sna ring 35, are washers 33, preferably of insu ation material, and 34preferably of metal. The washers 33`and 34 provide a seat for the diaphragm .32 which is held thereon by the pressure applied by the spring 37 through .the tip of the button 30. Surrounding the cup 31 'is an annular case or spacer 16 'preferably of phenol plastic compound. Both the cup 31 and the case 16 are preferably quite massive and `non-resonant at frequencies bel w 1800 cycles per second. Continuous wit the cup 31 is a threaded ange 36 305 which'engages the bushing 12 to secure the transmitter to the handle 7 and clamp the` case or spacer 16 securely between the surfaces 29 and 14. Large flat contacting surfaces are thereby eliminated and a jolnt non-resonant at frequencies'below 1800 cymouthpiece 40 is provided with longitudinal slots 42 countersunk to receive the lheads of the mounting screws 41, so that 1t may be removed without withdrawing the screws.

Connections are\ made to the transmitter through the bushing 12 and a spring 18 attached to a terminal 13.

Recesses 44 and 45 are provided in the handle for receiving the lugs 46 and 47 which extend laterally from the transmitter and receiver respectively, to 'facilitate' in positioning the instruments on their supporting handle. Lug 46 is particularly well adapted for preventing the case 16 and mouthpiece 40 carried thereby from moving out of alignment with respect to the supporting handle. y

The invention claimed is: s

1. In a telephone hand set having a bearing portion, areceiver, means for rigidly supporting said receiver at a number of small areas on said bearing portion, and securing means extending through said casing and into said bearing portion at said points of support.

2. In a telephone hand set, .a solid handle of insulating material having a bearingportion,x a receiver case of the sanie material having comparatively thick walls, raised bearing portions ofsmall area on said receiver case for engaging thc bearing portion of said handle and means passing through said case and said raised portions for rigidly securing the case to the handle.

3. In a telephone hand set, a handle having a depression in one endv thereof, a threaded ring secured in said depression and a transmitter cup having a rearwardly projccting flange engaging said ring within said depression, a spacer between said cup and handle for holding the transmitter in spaced relation with respect to said handle.

4. In a telephone hand set, a handle, a screw threaded ring embedded in said handle and disposed substantially at right angles with respect to said handle, a transmitter cup having a threaded portion for engaging said ring and an insulating spacer ring mounted on said cup, said cup having bearing portions for clamping said ring to said handle. f

In a telephone hand set, a solid handle of phenol plastic compound, threaded metal inserts in one end thereof, a phenol plastic receiver case having three bosses of small area on the bottom thereof, and

mounting screws through said bosses engaging said metal inserts to secure the receiver on the handle, said inserts and mounting screws forming electrical conducting paths to said receiver.

6. In a telephone hand set, a handle, the fundamental mode of vibration of which exceeds 1000 cycles per second, a transmitter case therefor having no resonance below 1800cycles per second, a receiver case having no resonance below 1800 cycles per second, means for supporting said receiver case on said handle at three small areas, a threaded iangerearwardly projecting from said transmitter for securing said translnitter to said handle, the joints formed between said instruments and said handle having no resonance below 1800 cycles per second. x-

7. In a telephone'hand set, a handle of phenol plastic compound, a receiver case having comparatively thick walls of the same material, said case Vcontacting with said 'handle lat three small areas, means through the receiver case at said areas for supporting it on the handle, a transmitter a transmitter case, and means integral with said transmitter engaging said handle and supporting said transmitter case thereon.

8. In a telephone hand set, a solid handle, an annular threaded bushing embedded in said handle at one end thereof, a transmitter cup threaded to engage said bushing and an annular rinr of the samematerial as said handle clamped by said cup to said handle, said ring having a small contacting surface with said handle. l

9,-A telephone hand set comprising a handle, a transmitter cup, a casing havingA comparatively thick walls of phenol plastic compound, said casing having a tapered thickness and presenting a small annular contacting surface to said handle, and a threaded annular flange embedded in said handle, said cup having a threaded engagement with said fiange-for clamping said casing to said handle.

10. A telephone hand set comprising a solid handle, a metal annular bushing embedded in said handle and forming a depression therein, terminals within said depression, a spring connected to one of said terminals, a transmitter cup, a mouthpiece therefor, said transmitter cup having threaded engagement with said bushing and contacting with ,said spring, the electrical connections being made to said transmitter through said bushing and said spring, a spacer ring mounted on said transmitter cup having a key portion engaging said handle for holding said mouthpiece against rotary movement on said handle.

11. A telephone hand set, a solid handle, conductors embedded therein, threaded bushings in each end of said handle forming terminals for said conductors, a receiver supported at three small areas on one end ol said handle screws through said supports 'for securing said receiver to said handle, said screws forming a continuation of said` conductors, a transmitter at the opposite end of said handle having threaded engagenient with one of said bushings, a casing a bearing portions cooperating with the bearing portion of the handle for holding said receiver in spaced relation with reference to said handle, and securing means extending through said case and, into said handle.

14. InL a telephone hand set,a solid-handle havlng a earing portion,conductors therein, threaded metal bushings in oneend of said2 handle connected to said conductors, a receiver case having raisedportions for engaging said' bearing portion, saidcase having openingsthrouvh. said portions, and screws passing through said openings and embedded in said handle and connected to said inserts, and screws engaging said inserts for securing the instrument casing to said handle, said (screws also serving to make conductive connection from said 1nserts to saidinstrument.

16. A telephon'ehand set comprising 'al moulded handle, a threaded ring embedded in one end'thereof, and a threaded telephone v,instrument cup screwed onto said ringnand `arranged to. form with s'aid ring a part of the electrical conducting path to the instrument."' 17. A telephone hand set comprising a moulded handle, a screit7 threaded ring embedded in'one end of said handle and disposed substantially at right'angles withl respect to said handle, a telephoneinstrument cup havinga threaded portion cooperating .with the thread on said ring, said ring and cup foriing an electrical conducting path to said iistrument.- Y

In Witness wh'ereof; I hereunto subscribe 'my name this Qndday of Eebruary it. D.,

' fHABRY R. CLARKE. 

